package com.example.cma

import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.camera.core.CameraSelector
import androidx.camera.core.CameraX
import androidx.camera.core.Preview
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import androidx.core.content.ContextCompat
import androidx.lifecycle.LifecycleOwner
import com.google.common.util.concurrent.ListenableFuture

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"

/**
 * A simple [Fragment] subclass.
 * Use the [BlankFragment.newInstance] factory method to
 * create an instance of this fragment.
 */
class BlankFragment : Fragment() {
    // TODO: Rename and change types of parameters
    private var param1: String? = null
    private var param2: String? = null


    private lateinit var cameraProviderFuture: ListenableFuture<ProcessCameraProvider>
    private lateinit var previewView: PreviewView


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
            param1 = it.getString(ARG_PARAM1)
            param2 = it.getString(ARG_PARAM2)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_blank, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        previewView= view.findViewById(R.id.previewView)
        cameraProviderFuture = ProcessCameraProvider.getInstance(view.context)//获得provider实例

        Log.e("onResume","cameraProviderFuture:$cameraProviderFuture")

        cameraProviderFuture.addListener(Runnable {
            val cameraProvider = cameraProviderFuture.get()
            bindPreview(cameraProvider)
        }, ContextCompat.getMainExecutor(view.context))
    }

    fun bindPreview(cameraProvider: ProcessCameraProvider) {
        cameraProvider.unbindAll();
        var preview: Preview = Preview.Builder()
            .build()

        if(param1 == "LENS_FACING_FRONT"){
            var cameraSelector: CameraSelector = CameraSelector.Builder()
                .requireLensFacing(CameraSelector.LENS_FACING_FRONT)
                .build()

            preview.setSurfaceProvider(previewView.getSurfaceProvider())

            var camera = cameraProvider.bindToLifecycle(this as LifecycleOwner, cameraSelector, preview)




        }else{
            var cameraSelector: CameraSelector = CameraSelector.Builder()
                .requireLensFacing(CameraSelector.LENS_FACING_BACK)
                .build()


            preview.setSurfaceProvider(previewView.getSurfaceProvider())

            var camera = cameraProvider.bindToLifecycle(this as LifecycleOwner, cameraSelector, preview)
        }
    }


    override fun onResume() {
        super.onResume()
        Log.e("onResume","onResume:$this")
    }

    override fun onPause() {
        super.onPause()
        Log.e("onPause","onPause:$this")
    }




    companion object {
        /**
         * Use this factory method to create a new instance of
         * this fragment using the provided parameters.
         *
         * @param param1 Parameter 1.
         * @param param2 Parameter 2.
         * @return A new instance of fragment BlankFragment.
         */
        // TODO: Rename and change types and number of parameters
        @JvmStatic
        fun newInstance(param1: String, param2: String) =
            BlankFragment().apply {
                arguments = Bundle().apply {
                    putString(ARG_PARAM1, param1)
                    putString(ARG_PARAM2, param2)
                }
            }
    }
}